The Grid Slammer is my preferred OD for a clean boost. Just the right amount of EQ in it to give your sound a nice growl with a rectifier. The recto heads do not need an EQ in the loop. The amp sounds amazing with just an overdrive and a gate.
The Mini rec however and rectoverb 25 however are whole different animals because of the EL84 power tubes and lower headroom. Those work great with an EQ similar to the classic Mark 5 band V, but with the bass end down at unity gain (middle of the slider).